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Nanofiltration System
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Shaanxi Di Ao Environmental Protection Group Co., Ltd.
Shaanxi, China
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Nanofiltration is a pressure-driven membrane separation technology that falls somewhere between reverse osmosis and ultrafiltration. Nanofiltration membranes have pore sizes of a few nanometers. It appears later than other pressure-driven membrane separation mechanisms. Its appearance can be traced back to the late 1970s, when J.E. Cadotte was researching the NS-300 membrane. Following that, nanofiltration advanced quickly, and the membrane stacker was marketed in the mid-1980s. Nanofiltration membranes are mostly produced from reverse osmosis membranes, including CA, CTA, aramid composite, and sulfonated polyethersulfone membranes.
Nanofiltration (NF) is a technique for separating compounds with low molecular weights, such as inorganic salts and small molecular organics like glucose and sucrose, from solvents. Nanofiltration, commonly known as low-pressure reverse osmosis, is a growing area of membrane separation technology. Its separation performance falls somewhere between reverse osmosis and ultrafiltration, with some inorganic salts and solvents passing through the membrane to achieve separation.
Working principle.
 Nanofiltration membranes are charged membranes capable of electrical adsorption. Under same water quality and environmental conditions, the nanofiltration membrane requires less pressure than the reverse osmosis membrane. As a result, in terms of separation principle, nanofiltration and reverse osmosis have both similarities and differences. The nanofiltration membrane's pore size and surface characteristics determine its unique performance, and it has different Donann potentials for ions with different charges and valences; the nanofiltration membrane's separation mechanism combines sieving, dissolution, and diffusion, as well as charge repulsion. It can effectively remove divalent and multivalent ions, as well as various substances with molecular weights greater than 200, and partially remove monovalent ions and substances with molecular weights less than 200. Nanofiltration membranes have significantly better separation performance than ultrafiltration and microfiltration. In comparison to the reverse osmosis membrane, it offers the following advantages: partial elimination of monovalent ions, low process osmotic pressure, low operating pressure, and energy savings.

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